The present investigation is combined heat and mass transfer effects on the MHD free convection flow of an electrically conducting and chemically reacting incompressible viscous fluid over an inclined plate embedded in a porous medium in impulsively started plate with variable temperature and mass diffusion is considered. The dimensionless momentum equation coupled with the energy and mass diffusion equations are analytically solved using the perturbation method. The effects of pertinent parameters on velocity, temperature and concentration profiles are graphically displayed whereas the variations in skin friction, Nusselt number and Sherwood number are shown through tables.